Type-writing machine.



W. P. MCLAUGHLIN.

TYPE WRITING MACHINE.

APPLICATION FILED JUNE 30, 1909.

Pate n t'd June 7, 1910.

-UNITED STATES PATENT FFICE.

WILLIAM P. McLAUGHLIN, OF NEW YORK, N. Y., ASSIGNOR T0 UNDERWOOD TYPE- WRITER COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.,

TYPE-WRITING MACHINE.

Specification of Letters Patent.

Application filed June 30,1909. Serial No. 505,148.

' platens for typewriting machines.

The object of theinvention is to produce, at low cost, practical and eflicient means for absorbing the sound vibrations produced by the blows of the types upon the platen.

In carrying out the invention, 1 line the usual rubber outer shell of the platen with cork, and fill the interior with saw-dust. Plugs are inserted in the ends of the platen, and a tube is secured at its ends in said plu s; the usual platen axle passing through sai tube and through the usual heads, which are secured to the plugs.-- The provision of the central tube permits the axle to be withdrawn without liability of any of the granular packing running ,out from the platen.

In the accompanying drawing, Figure 1 is a longitudinal section of a typewriter platen embodying my invention. F g. 2 is a transverse section on the line XX of Fig. 1. Fig. 3 is anend view of Fig. 1.

The usual rubber laten shell 1 is provided with a lining of cor 2 about as thick as the shell 1.' The lining may be glued .to the shell, the inner face of the latter being preferably roughened before the glue is applied. The cork .2 may be produced by boiling or otherwise moistening a sheet of cork toredue it to a pliable condition, so that it may be bent into a tube. The chamber of the platen is filled with sawdust 3 or other suitable sound-deadenin substance, preferably granular. Said saw ust packing 1s confined between plugs 4, which fill the outer shell 1, and are glued or otherwise secured thereto.

' Extending through the plugs 4 is a central Patented June "2', 1910.

tube 5, preferably of metal, and fixed tightly in said plugs. The latter may be made of indurated fiber for lightness and stiffness and convenience in gluing the .same to the shell 1. The usual platen axle 6 is inserted through the tube 5 and platen heads 7, wlhich may be scoured by screws -8 to the p s 4.

' aving thus described my invention, I

claim:

1. A typewriter platen comprising an outer shell roughened on its inner surface, a tube of cork glued to said inner surface, and a sawdust packing within said tube.

2. A typewriter platen comprising a shell, a tube of cork fitting therein, a sawdust packing within said tube, and fiber heads for said shell.

3. In a typewriter platen, the combination with an impact-receiving shell, of a lining of cork for said shell, a central tube, a sawdust packing between said lining and said tube, and a platen axle extending through said central tube.

v 4. A typewriter platen comprising an outer shell, plugs in the ends of said shell, a sound-absorbing lining for said shell, 2.

' central tube fixed in'said plugs, the chamber between the central tube and the liningbeing filled with sound-deadening material, an}? an axle extending through said central tu e.

5. A typewriter platen comprising an outer shell, lugs inthe ends of said shell, a sound-absorbing lining for said shell, a .central tube fixed in said plugs, the chamber between the central tube and the linin being filled with sound-deadening materia heads fixed upon said plugs, and an axle extending through said heads and said central tube. W. P. MGLAUGHLIN/ Witnesses:

C. S. PEMBERTON, S. FALK. 

